The Effect of Repeated Firings on Shade of Metal Ceramic.
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Objectives The purpose of this study was to investigate whether repeated firings effect the shade of porcelain when fused to metal. Materials and Methods A total of 35 disc-shaped samples of 2mm thickness and 10mm diameter, 3D printed in polylactic acid (PLA) and cast in NIADUR Nickle Chrome (NiCr) dental alloy, were veneered with VITA shade A2. The metal-ceramic discs were subjected to a total of six firings, with colour measurement of each sample being recorded after each firing via the VITA Easyshade spectrophotometer. In order to compare the shade of the ceramic as a single value, a delta value (ΔE*) for each sample was calculated with the use of CIELab formula. The one-way ANOVA test was performed to determine a significant difference. Results The ANOVA demonstrates statistically insignificant difference in shade between the first and the sixth firing, as P= 0.189371. The ANOVA revealed an increase in the average delta value (ΔE*) between the first and sixth firing with a difference of 3.6; results found were clinically unacceptable. All samples were veneered with the shade A2, however, all samples produced shades other than the desired shade A2. Conclusion Due to limitations of this study, the results demonstrated an insignificant difference which failed to reject the null hypothesis. However, due to inconsistency of samples, results provided are inconclusive and cannot be compared with other studies. Furthermore, results of this investigation indicate that the shade of porcelain – fused-to-metal, during the six firings, are clinically unacceptable.
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